Definition of lorazepam - a drug of the benzodiazepine group, used s: from (ch)lor(o-) ('chlorine') + -azepam, on the pattern of words such as diazepam. Drug information on Ativan (lorazepam (oral)), includes drug pictures, side effects, drug Generic Name: lorazepam (oral) (Pronunciation: lor A ze pam). What is. Benzodiazepines (BZD, BZs), sometimes called benzos , are a class of psychoactive drugs .. Oxazepam and lorazepam are often used in patients at risk of drug . D or X meaning potential for harm in the unborn has been demonstrated. . reported were decreased IQ, visiomotor coordination, information processing.